Made of safe material, no trace, no drill, and keeps your storage box beautiful. Perfect for bookshelves, shoe bins, toy bins, underbed storage, and shopping carts. If the storage box has caster wheels, it will be very easy to move when changing houses or cleaning. Let the storage box be moving: The casters can be attached to the bottom of the storage box, sorting box, and garbage can, making them easier and more convenient to move. No trace, no drill, and keep beautiful: Using these adhesive casters does not damage the surface, leaves no trace, requires no drilling, and does not affect the appearance of the storage box. Easy to install and use: Simply peel off the film on the back and firmly press onto a smooth surface. It is recommended to wait 24 hours before use for best results. Color: White Material: ABS Size: 4.7 x 2.4 x 1.8 cm Package Contents: 4 x Non-rotating casters Only the above package content is included; other products are not included. Note: Lighting and different displays may cause slight color differences between the image and the actual item. Measurement allows an error of +/- 1-3 cm.